%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2006-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(http_uri).
-export([parse/1]).
-export([encode/1, decode/1]).
%%%=========================================================================
%%% API
%%%=========================================================================
parse(AbsURI) ->
case parse_scheme(AbsURI) of
{error, Reason} ->
{error, Reason};
{Scheme, Rest} ->
case (catch parse_uri_rest(Scheme, Rest)) of
{UserInfo, Host, Port, Path, Query} ->
{Scheme, UserInfo, Host, Port, Path, Query};
_ ->
{error, {malformed_url, AbsURI}}
end
end.
encode(URI) ->
Reserved = sets:from_list([$;, $:, $@, $&, $=, $+, $,, $/, $?,
$#, $[, $], $<, $>, $\", ${, $}, $|,
$\\, $', $^, $%, $ ]),
lists:append(lists:map(fun(Char) -> uri_encode(Char, Reserved) end, URI)).
decode(String) ->
try
begin
do_decode(String)
end
catch
throw:{bad_hex_value, _BadChar} ->
%% The string is either badly encoded or a string
%% containing a % followed by a non-hex char.
%% In any case, return as-is since there is nothing
%% we can do...
%% Note that the valid hex-chars are: 0-9, a-f and A-F.
String
end.
do_decode([$%,Hex1,Hex2|Rest]) ->
[hex2dec(Hex1)*16+hex2dec(Hex2)|do_decode(Rest)];
do_decode([First|Rest]) ->
[First|do_decode(Rest)];
do_decode([]) ->
[].
%%%========================================================================
%%% Internal functions
%%%========================================================================
parse_scheme(AbsURI) ->
case split_uri(AbsURI, ":", {error, no_scheme}, 1, 1) of
{error, no_scheme} ->
{error, no_scheme};
{StrScheme, Rest} ->
case list_to_atom(http_util:to_lower(StrScheme)) of
Scheme when Scheme == http; Scheme == https ->
{Scheme, Rest};
Scheme ->
{error, {not_supported_scheme, Scheme}}
end
end.
parse_uri_rest(Scheme, "//" ++ URIPart) ->
{Authority, PathQuery} =
case split_uri(URIPart, "/", URIPart, 1, 0) of
Split = {_, _} ->
Split;
URIPart ->
case split_uri(URIPart, "\\?", URIPart, 1, 0) of
Split = {_, _} ->
Split;
URIPart ->
{URIPart,""}
end
end,
{UserInfo, HostPort} = split_uri(Authority, "@", {"", Authority}, 1, 1),
{Host, Port} = parse_host_port(Scheme, HostPort),
{Path, Query} = parse_path_query(PathQuery),
{UserInfo, Host, Port, Path, Query}.
parse_path_query(PathQuery) ->
{Path, Query} = split_uri(PathQuery, "\\?", {PathQuery, ""}, 1, 0),
{path(Path), Query}.
parse_host_port(Scheme,"[" ++ HostPort) -> %ipv6
DefaultPort = default_port(Scheme),
{Host, ColonPort} = split_uri(HostPort, "\\]", {HostPort, ""}, 1, 1),
{_, Port} = split_uri(ColonPort, ":", {"", DefaultPort}, 0, 1),
{Host, int_port(Port)};
parse_host_port(Scheme, HostPort) ->
DefaultPort = default_port(Scheme),
{Host, Port} = split_uri(HostPort, ":", {HostPort, DefaultPort}, 1, 1),
{Host, int_port(Port)}.
split_uri(UriPart, SplitChar, NoMatchResult, SkipLeft, SkipRight) ->
case inets_regexp:first_match(UriPart, SplitChar) of
{match, Match, _} ->
{string:substr(UriPart, 1, Match - SkipLeft),
string:substr(UriPart, Match + SkipRight, length(UriPart))};
nomatch ->
NoMatchResult
end.
default_port(http) ->
80;
default_port(https) ->
443.
int_port(Port) when is_integer(Port) ->
Port;
int_port(Port) when is_list(Port) ->
list_to_integer(Port).
path("") ->
"/";
path(Path) ->
Path.
uri_encode(Char, Reserved) ->
case sets:is_element(Char, Reserved) of
true ->
[ $% | http_util:integer_to_hexlist(Char)];
false ->
[Char]
end.
hex2dec(X) when (X>=$0) andalso (X=<$9) -> X-$0;
hex2dec(X) when (X>=$A) andalso (X=<$F) -> X-$A+10;
hex2dec(X) when (X>=$a) andalso (X=<$f) -> X-$a+10;
hex2dec(X) -> throw({bad_hex_value, X}).
